Criefbi



4 Sheets-Sheet 1.

(No Model.)

B W MONGRIEFF SUCTION BOX FOR PAPER MACHINES.

' No 504,886; Patented Sept 12, 1893;

WITNESSES= (No Model) 4 sneet-sheet 2.

. R. W. MONGRIEPF.

SUCTION BOX FOR PAPER MAGHINES. No. 504,885. sPatented Sept. 12, 1893.

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VENT wrnvsssz s: IN OR (No Model.) 4 Sheets-Sheet 3.

R W MONORIEPF SUCTION BOX FOR PAPER MACHINES.

No. 504,885. 'Patentedsepti 12, 1893.

INYENTOR:

WIT/ViSSES:

UNITED STATES PATENT OFFICE.-

ROBERT W. MONCRIEFF, OF MANCHESTER, ENGLAND.

SUCTION-BOX FOR PAPER-MACHINES.

SPECIFICATION forming part of Letters Patent No. 504,885, dated September 12, 1893. Application filed November 21, 1892. Serial No. 452,739. (No model.)

To aZZ whom it may concern.-

Be it known that I, ROBERT WIGHTON MON- CRIEFF, of Manchester, England, have invented certain new and useful Improvements in suctlon-Boxes for Paper-Machines, of which the following is a specification. My invention has reference to paper mak- 1ng machines and its object is to provide more efficient means for extracting the water or molsture from the pulp while upon any suitable interstitial paper former, as traveling paper making molds or upon an endless paper making wire web, and also to reduce the wear and tear of molds or machine wire web. It is applicable to machines of the kind in which are employed separately laid or Woven molds hinged or connected together so as to form an endless series or chain of traveling molds which successively receive the pulp from a pulp box or other source of supply and also to machines of the kind in which an endless wire web is employed as in a Fourdrinier machine.

The improvements consist in theconstruction of the machines with an airtight or sealed vacuum chamber below the line of travel of the molds or endless wire web (as the case may be) between the pulp supply and the couching roll or point where the paper quits the molds or wire web, the top of the said air tight or sealed chamber being formed partly by the pulp itself and partly by the under side of the dekle straps, the bottom by the water in a suction box fitted with suction pipes, the sides by contact beds or surfaces beneath the paper former of a more or less yielding or elastic nature preferably consisting of thin flexible sheets or belts of air tight material exposed to the air at one side and at the other contacting with the under side of the paper former, with which in the case of separate mold machines the lower edge of the cross bars and frames of the molds, and in the case of endless wire web machines the under side of the wire web, come in close contact, at a plurality of points which beds cover a plurality of the interstices of the paper former and extend substantially across the entire under face of the paper former, and the ends by devices which are situated in the suctionbox and press against the side edges of the paper former, that is, in the separate mold machine, against the mold edges, and in the endless wire web machine against the wire Web edges. The beds or surfaces of a more or less yielding or elastic nature with which the lower edges of the frames and cross bars of the molds or the under surface of the endless wire web (as the case may be) come in contact so as to form the sides of the air tight chamber, preferably consist of endcross bars of the molds are made exactly level at the bottom and deep enough to come below the level of the under edge of the traveling links or frames by which they are carried.

In the accompanying drawings:-Figure 1 is a section taken longitudinally on the line l-1 of Fig. 2 (the suction pipes being in elevation) of a portion of a paper making machine constructed with separate molds and having a suction box, suction pipes and air tight or sealed chambers arranged in accordance with the preferred form of my invention. Fig. 2 is a section on the line 22 of Fig. 1. Fig. 3 is a plan of the suction box and of the devices fitted therein, parts of the end frames of the mold being also seen. Fig. at is a diagrammatic partial side elevation on a smaller scale of the paper making machine and illustrating the general arrangement of the machine and the position of the suction box. Fig. 5 is a fragmentary section on the same line as Fig. 1 illustrating a modification. Fig. 6 is a longitudinal section, the same as Fig. l, but illustrating the application of my invention to an endless wire Web machine.

Referring first to the machine illustrated by Figs. 1 to 4, wherein the paper former is as usual interstitial and consists of molds, each mold consists of the surface a of woven wire carried and supported byside frames b b, end frames 0 c and cross bars d d. The

side frames b b are secured together with in-.

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tel-posed metal strips 6 e to bars f f placed transversely to the line of travel. The strips 6 e extend up to the level of the mold surface a, and the dekle wires 9 g are sol- .dered or otherwise connected thereto. The bars f f to which the-side frames b, b, of each mold are secured extend beyond said side frames and are connected by hinges h h to the corresponding bars f f of the adjoining molds to enable the molds to travel round the ends of the main framing of the machine as seenin Fig.4. The two bars. f f of each mold are connected at their ends to two bars f f placed at right angles thereto, and the mover. *They impart a regular on-ward movement to the'endlesschain of molds, the'racks on :the'bars f f of the molds coming-successively into gear with said wheels. There are-rollers f on the frames -f f to run in guidesj i'f on themain' framing of the machine.

70, Fig. 4, is the pulp box fromwhich pulp fiows ina uniform stream or sheet upon the" moldsas they successively pass under it.

[I arethe dekle straps passing round guide plates *1 r are kept pressed by springs s 3 against the side edges of the paper former, 1 this edge in the construction shown being the mold ends, the top of these plates justclearrollers as usual.

.All "the parts above-referred'to in the de-- scription of-the drawings are of known'construction except that for the purpose of myinvention'the sideframes b b, end frames 0 c and cross bars (1 d of the molds instead of being made as heretofore-somewhat less deep tha'n'thebars ffff f'aremade deep enough tocome below the level of the under edge of; these bars, and the said frames 2) b and c andsaid cross-bars d d must be exactly level at bottom, which has not hitherto necessarilybeenthe case.

m is a suction'box situated below the line of travel of the molds between the-pulp box The suction "box hand the couching roll u. shown in the drawings is arranged for the formation of two airtight or sealed chambers according to my invention, but the number of-such chambers is optional; one willin many-casessuffice While there may be more than two if thought desirable. The box m may be partly filled with and kept constantly supplied with water from any-comveni-ent source; its-level while the machine is .tion-inthebox.

The belts constitutecontact-beds extending substantially across the entire width of the under side of the paper former, and contacting therewith at aplurality of points whereby they cover a ;pl-urality of the interstices thereof to prevent leakage thereunder.

The first belt and thesecond belt in conj unction with thesuccessive cross bars (1 d and side frames 1) b'ofthe traveling molds form the two sides of the first air tight chamber 'and-thesecond belt and the third belt (when such is employed) similarly form the two sides of a second air tight chamber. The wetter in the box'm forms the bottom ofthe said chamber or chambers, and thepulp on the mold surface in conjunction with thedekle strapsl Z'the-top of-same. The-ends of the :said chambers-are formed by boards orzbl'ocks t'tand rubber-faced platesr r-in conjunction with the end frames '0 c-of themoldsy-the ing the bottom OflthG bars f f. The springs :8 s are supported by the blocks it which are .fixed in thesuctionbox m.

- In each'air tight chamber are the opener-ids Three suction pipes to each cessively over'the said chamber.

In the modification-represented in Fig.5

:the second side of the air tight chamber in- :stead of being formed-by contacto'f the mold framesand cross bars-with an india rubber belt is formed by contact of said-frames and -cross bars with thin-flexibleairtight sheets or strips of india rubber or other suitable material w w, of which theremay be twoias shown, or more,-fastened to the side of the suction box m.

In'Fig. 6, a represents an interstitial paper former consisting of an endless wire "web which as it travels is in close contact'with the I a and partly against the dekle straps Z.

What I claim, and desire to secure by Letters Patent, is-

1. In a paper making machine, the combination with a traveling interstitial paper former, of a suction water box below the line of travel of said paper former, a suction pipe in said box, and a bed in said box consisting of a thin flexible sheet of air tight material contacting at one of its sides with the under side of said paper former across substantially the entire width of the under face thereof and exposed to the air at its other side, said sheet, when a suction is created in said box, pressing under the pressure of the outer air tightly against the under side of said paper former where it contacts therewith, and thereby preventing leakage into the suction box, substantially as and for the purpose set forth.

2. In a paper making machine, the combination with a traveling interstitial paper former, of a suction box below the line of travel of said paper former,- a suction pipe in said box, and plates contacting with the side edges of said paper former to prevent leakage at said edges into said box, substantially as and for the purpose set forth.

3. In a paper making machine, the combination with a traveling interstitial paper former, of a suction box below the line of travel of said paper former,a suction pipe in said box, beds in front of and behind said pipe each contacting with the under side of said paper former across substantially the entire width of its under face, each contacting with its said face at a plurality of points,

whereby each covers a plurality of interstices of said paper former and prevents leakage between the latter and the beds into said box, and plates contacting with the side edges of said paper former and preventing leakage at said edges into said box, substantially as and for the purpose set forth.

4. In a paper making machine, the combination with a traveling interstitial paper former, of a suction box below the line of travel thereof, a suction pipe in said box, and

beds in front of and behind said suction pipe contacting with the under face of said paper former to prevent leakage under the latter, and consisting of endless belts n contacting with said paper former across substantially its entire under face, and rollers 19 carrying said belts, substantially as and for the purpose set forth.

5. In a paper making machine, the combination with an endless traveling interstitial paper former consisting of a plurality of molds hinged together and having surface a of woven Wire carrying a wet web of paper, frames 19, edge frames 0, and cross-bars at supporting said surface a,'of track f carrying said former horizontally throughout aportion of its travel, suction box m beneath said former at the point of its horizontal travel, a suction pipe '0 within said box, flexible beds at each side of said suction pipe contacting with the under said box, boards 25 beneath said edge frames 0 of the paper former between said beds, and

plates 1' contacting with the outer sides of said boards and the outer edge frames 0 of the paper former, and closing the joint there between to prevent leakage into said box: at the edges of said paper former, all combined and arranged substantially as and for the purpose set forth,

6. In a paper making machine, the combination with a traveling paper former of the suction box m, suction pipes 'v, rollers p 0, endless traveling belts to 0% adapted to form close contact with the under side of said paper former, boards 25 t and plates r 4" kept in contact with the sides of said paper former substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

ROBERT W. MONORIEFF. Witnesses:

FRED MARTIN, WILLIAM KAY. 

